Graft copolymerisation of acrylamide onto cashew gum

被引：0

作者：

da Silva, Durcilene A. ^{[1
]}

de Paula, Regina C.M. ^{[1
]}

Feitosa, Judith P.A. ^{[1
]}

机构：

[1] Departamento de Química Orgânica e Inorgânica, Universidade Federal do Ceará, C. Postal 12.200, 60.455-760 Fortaleza, CE, Brazil

来源：

European Polymer Journal | 2007年 / 43卷 / 06期

关键词：

The synthesis of cashew gum-g-polyacrylamide was carried out at 60 °C by a radical polymerisation using potassium persulphate as the redox initiator under N2 atmosphere. A series of graft copolymers; varying in acrylamide concentration and keeping the concentration of the initiator and polysaccharide constant; was prepared. These graft copolymers were characterised by elemental analysis; infrared and 13C NMR spectroscopy; rheological studies; differential scanning calorimetry and thermogravimetric analysis. Comparisons amongst grafting parameters of the reaction of various natural polysaccharides with polyacrylamide (PAM) were carried out. High percentages of acrylamide conversion (%C) and grafting efficiency (%E) were obtained for cashew gum (CG); even with a low acrylamide/gum ratio. All copolymers had intrinsic viscosity and thus the hydrodynamic volume much higher than the CG value and closer to the PAM. The CG-g-PAM solution had an absolute viscosity at 2.5% concentration (wt./vol.) up to 33 and 3.3 times the CG and PAM values; respectively. Grafting of PAM chains onto the polysaccharide enhances its thermal stability. © 2007 Elsevier Ltd. All rights reserved;

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摘要：

Journal article (JA)

引用

页码：2620 / 2629